diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index 6c81afb..e583177 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -1,3 +1,6 @@
+### 1.2.19
+* guarded conditional LevelChangedException
+
 ### 1.2.18
 * removed LevelChangedException
 
diff --git a/src/FSharp.Data.Adaptive/Core/AdaptiveObject.fs b/src/FSharp.Data.Adaptive/Core/AdaptiveObject.fs
index fd2d638..e146e36 100644
--- a/src/FSharp.Data.Adaptive/Core/AdaptiveObject.fs
+++ b/src/FSharp.Data.Adaptive/Core/AdaptiveObject.fs
@@ -164,10 +164,10 @@ module AdadptiveObjectExtensions =
                     if depth > 1 then Transaction.RunningLevel - 1
                     else Transaction.RunningLevel
 
-                // if AdaptiveObject.UnsafePerformLevelChecking && x.Level > maxAllowedLevel then
-                //     //printfn "%A tried to pull from level %A but has level %A" top.Id level top.Level
-                //     // all greater pulls would be from the future
-                //     raise <| LevelChangedException(x.Level + depth)
+                if AdaptiveObject.UnsafePerformLevelChecking && x.Level > maxAllowedLevel then
+                    //printfn "%A tried to pull from level %A but has level %A" top.Id level top.Level
+                    // all greater pulls would be from the future
+                    raise <| LevelChangedException(x.Level + depth)
                                                                      
                 res <- r